Claude Sonnet 5.5 Scores 68 on the Coding Agent Index at Max Effort

What happened

In Claude Code, Sonnet 5.5 scores 68 on the Coding Agent Index at max effort and 63 at xhigh. The xhigh setting costs $3.33 per task versus $14.19 at max, a 77% reduction for 5.5 fewer Index points. Max generates 4.8× as many output tokens and takes 3.4× as many turns, while improving all three benchmark scores; its largest gain is on Terminal-Bench 4.0, from 58.1% to 66.2%.

The story so far

Artificial Analysis reported that Anthropic’s Sonnet 5.5 scored 68 on the Coding Agent Index at max effort in Claude Code, compared with 63 at xhigh, with max costing $14.19 per task versus $3.33 for xhigh. Artificial Analysis described xhigh as costing 77% less for 5.5 fewer Index points. Max generated 4.8 times as many output tokens and took 3.4 times as many turns, while improving scores on all three benchmarks. Its largest gain was on Terminal-Bench 4.0, where the score rose from 58.1% at xhigh to 66.2% at max.

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